1D histograms of solar wind properties for five different coronal hole wind characterizations: Zhao et al. (2009) coronal hole (referred to in this and the following figures as Zhao coronal hole), Xu & Borovsky (2015) coronal hole (referred to in this and the following figures as X&B coronal hole), 7-means CH1, 7-means CH2, and a combination of the two 7-means coronal hole wind types, which is referred to as 7-means CH1+CH2. Solar wind properties from top (a) to bottom (g): Proton speed v_p, proton density n_p, proton temperature T_p, magnetic field strength B, proton-proton collisional age log(a_{col, p − p}), O charge-state ratio $log(n_{{\text{O}}^{7+}}/n_{{\text{O}}^{6+}})$, and average Fe charge-state ${\stackrel{\sim }{q}}_{\text{Fe}}$. The histograms in panels (e) and (f) are weighted by the logarithmic bin size. All 1D histograms (with 50 bins each) are normalized to their respective individual maximum. The fraction f of included data points in each histogram is shown in an inset.